According to the Centre of the United Nations News, Mogherini said that at the U.N. Security Council on the European Union – United Nations cooperation.

Federica Mogherini: "The European Union will continue to stand for Ukraine's territorial integrity – and does not recognise the illegal annexation of Crimea and Sevastopol. We are working closely with Kyiv to help them achieve the reforms the country so urgently needs."

She referred to constitutional amendments approved by the Ukrainian parliament just days ago which will improve the efficiency and independence of the judicial system in the country.

The E.U. top official also added that "the end of the conflict in Ukraine remains a top priority for the EU".

Federica Mogherini: "The Minsk agreements have to be fully implemented in all their parts, if we want the situation in eastern Ukraine to calm down".

Mogherini added that the UN office for coordination on humanitarian affairs is doing a precious job in mapping and organising humanitarian assistance there.

Federica Mogherini:"The UN reports on human rights in Ukraine – financed by our European Union – are also of great help to monitor the situation."

In February 2014 armed Russian units dubbed ‘little green men'stormed the regional parliament building in Crimea. Soon after, unmarked forces began appearing near Ukrainian military bases in the peninsula. On March 16, 2014 Russian authorities held a so-called referendum in Crimea which violated international law. That led to the US and EU imposing a number of economic sanctions targeting key sectors of the Russian economy.